Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/121768
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Type: Journal article
Title: From hatch to egg grading: monitoring of Salmonella shedding in free-range egg production systems
Author: McWhorter, A.R.
Chousalkar, K.K.
Citation: Veterinary Research: an international journal of animal infection and epidemiology, 2019; 50(1):58-58
Publisher: BioMed Central
Issue Date: 2019
ISSN: 0928-4249
1297-9716
Statement of
Responsibility: 
Andrea R. McWhorter and Kapil K. Chousalkar
Abstract: Human cases of salmonellosis are frequently liked with the consumption of contaminated table eggs. Recently, there has been an increase in consumer demand for cage-free eggs precipitating the need for a greater understanding of Salmonella dynamics in free-range production systems. A longitudinal study was conducted to determine the points in production where birds are most likely to be exposed to Salmonella and where the risk of egg contamination is highest. In this study, two free-range flocks were sampled from hatch to the end of production. At hatch, all chicks were Salmonella negative and remained negative during rearing. During production, the proportion of positive samples was low on both farms. Salmonella positive samples were detected intermittently for Flock A. Dust, nest box, and egg belt swabs had the highest proportion of positive samples and highest overall loads of Salmonella. The egg grading floor was swabbed at different points following the processing of eggs from Flock A. Only the suction cups that handle eggs prior to egg washing tested positive for Salmonella. Swabs collected from machinery handling eggs after washing were Salmonella negative. During production, positive samples from Flock B were observed at only single time point. Dust has been implicated as a source of Salmonella that can lead to flock to flock contamination. Bulk dust samples were collected and tested for Salmonella. The proportion of positive dust samples was low and is likely due to physical parameters which are not likely to support the survival of Salmonella in the environment.
Keywords: Ovum
Animals
Chickens
Salmonella
Salmonella Infections, Animal
Poultry Diseases
Prevalence
Risk Factors
Longitudinal Studies
Animal Husbandry
Australia
Bacterial Shedding
Rights: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
DOI: 10.1186/s13567-019-0677-4
Published version: http://dx.doi.org/10.1186/s13567-019-0677-4
Appears in Collections:Animal and Veterinary Sciences publications
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